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Old 03-18-2016, 11:48 AM   #1
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Dumb PDF to epub or similar?

What's the current best way to recover text from a pdf featuring low res scans of a printed page?

These (typically large) books are difficult for me to read due to font sizing and clumsy pdf zooming especially on Android tablets.

For my sins, I had work making such books for a period. We would scan @ 400 DPI if the print was any way small, (300dpi otherwise), process under windows with Abbey Fine Reader, and Adobe Acrobat, and then put text under the images & shrink file size to under 300 Megs by reducing image resolution. The reason for the last stage was that windows gave memory issues with Adobe tools and large files.

I run slackware-14.1, and have Fedora locked up in a VM.
Old 03-18-2016, 02:33 PM   #2
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The text on the page isn't text at all, the page is a graphic image. Years ago, I experimented with a scanner and OCR software but it was not very good, and fixing the errors was not worth the effort...
Old 03-18-2016, 04:01 PM   #3
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Results vary, but calibre can convert .pdf to a number of ebook formats, including epub. Not sure what the results would be like with a low res pdf, but its worth a try...

Old 03-19-2016, 11:26 PM   #4
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Yes, I would start with calibre. If that didn't work, there are websites that do conversions. Doing large files can be iffy, though.


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